>> well, i think we really need to understand there is no established science right now to determine whether or not a gene will predispose someone to violent behavior. i mean that's the first thing. this is a very complicated situation. people have genes. they don't always predispose or actually turn into a specific problem. and in this case if someone were to be found to have a gene, and this is a needle in a haystack, it might give some clues as to whether or not someone might or, other people might be predisposed to this kind of crime. heather: this would be a first of a kind study or a first of a kind research to >> again, there have been studies that have been done on violent offenders, and previously and we have gotten some body of evidence that helped us to determine whether this is a problem. where it is more established, where we're doing genetic testing where it is incredibly value in determining predisposing conditions such as taysak's disease or whether someone ends up with sickle cell anemia. whether someone is predisposed to alzheimer's or cancer it gets controversial a